Speedo
Project Rank in Object-Relational Persistence:  7
Speedo is an open source implementation of the JDO(TM) 1.0.1 specification. It is hosted by ObjectWeb.
Speedo main benefits
- Possible choice of optimistic or pessimistic transaction mode
- Locking managed by Speedo itself or by the database (clustering support)
- Cache of persistent objects (L2), with a choice of several replacement policies (LRU | MRU | FIFO | ...) configurable per class.
- Data prefetching at query evaluation time: later accesses to objects will not require any I/O to the data store
- Lazy loading of data and support of fetch groups (JDO2)
- Management of relation ships (coherency management)
- Able to create the SQL schema dynamicaly and to provide sql script
- Various identifier support (application (composite or single), SQL sequence, speedo)
- Lot of types supported
- Lot of databases supported (Oracle, MS SQL server, Mysql, Postgres, ...)
- Through JORM and MEDOR, access to legacy relational databases, as well as any other data store supported by JORM and MEDOR
- Http console for administration
- Soon fully JDO 2.0 ...
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